Procedurea.DC analysis1.Construct the circuit in Fig. 22.Measure all Dc values and fill out Table – 23.Apply 4V peak to peak 1kHz sinewave to the input Vin in Fig.2 4.Display Vin, Vout1, Vin and Vout2 with the oscilloscope
5.Compute both voltage gains6.Record the phase shiftb.AC Analysis for Common Emitter (CE) Amplifier1.Construct the circuit in Fig. 32.Apply a sinusoidal input signal with 100mV peak to peak and 4kHz3.Measure vs, vx and vout4.Measure the peak to peak of the maximum output voltage 5.Decrease the frequency and record values for Vout6.Determine frequency at the lower 3dB point7.Determine frequency at the upper 3dB point8.Determine bandwidth9.Computer Ri, voltage gain and bandwidth of the CE amplifier10. Remove the 46uF capacitor11. Measure voltage gain12. Measure bandwidthResults and Discussiona.DC AnalysisTable – 2VCE (V)VBE (V)VB (V)IC (mA)IE (mA)IB (mA)7.480.644.530.8210.8120.006The values of table 2 and table 1 (theoretical table) are similar. The difference in the values can be due to the precision of the equipment used during the lab and small manipulation errors.Beta=IC/IB=0.821m/0.006m=136.83
Vout1/Vin=4.15V/4.23=0.981V/VVout2/Vin=Vout1/Vin=0.981V/VBoth gains are approximately 1 which is close to the theory value. Also, since both gains are the same, this means that there is no phase shift.